Valve mechanism



May 29, 1934.

s. L. WHEELER ET AL 1,960,963

VALVE MECHANISM Filed Jan. 6. 1933 17 a.

I I /e I I 20 z/ 2/ 3 .22

SE mvsmom ma BY W Win91 ATTORNEYS Patented May 29, 1934 VALVE MECHANISM Sylvester Lawrence Wheeler, Wauwatosa, and Earl- J. Seifert, Milwaukee, Wis., assignors to Milwaukee Valve Company, Milwaukee, Wis., a

corporation of Wiscon Application January 6,

8 Claims.

This invention relates to improvements in valve mechanisms and, more particularly, to a double check valve structure. The present application concerns a modification of the structure disclosed in the companion application of Valentine Fina,

Serial No. 641,341, filed November 5, 1932.

It is the primary object of the invention to pro vide novel and improved means for separately guiding each of two valves in a dual check valve structure with reference to a valve seat member with which the respective valves are associated. By means of the invention it is sought to ensure the proper alignment of each valve separately with respect to the valve seat member so that any factor which may tend to unseat one of the valves will have no effect upon the other. It is a further purpose of the invention to enable the movement of one of the valves to be entirely independent of the movement of the other valve and to 29 provide independent means for limiting the motion of the respective valves without any necessity of contact of any sort between them.

It is a further purpose of the present invention to provide a novel valve guiding organization in which a tube removablyconnectedwith a valve seat member serves as a guide for both of the valves co-acting with the valve seat member and is ported for the relief of any pressures which might otherwise be occasioned by the movement 0 of the valves with respect to the guiding means.

In the drawing: Figure 1 shows in vertical axial section, a valve structure embodying the invention.

Figure 2 is a detail View in perspective showing 5 the valve guiding means.

Like parts are designated by the same reference characters throughout the several views.

The casing 1 has the usual inlet and outlet I a ports 2 and 3. It is provided at 4 with a large removable closure which is screwed into the easing in axial alignment with port 2.

Spaced from port 2 within the casing is an an nular bracket 5, preferably recessed to receive the packing 6. Closely fitted within the bracket 4 5 is a removable valve seat member 7 flanged to rest on packing 6 and of such dimensions as to be removable bodily from the casing through the opening into which closure 4 is normally screwed. The valve seat member 7 provides one seat at 8 for valve 9 and a second seat at 10 for valve 11.

Removably screw threaded to the valve seat member 7 within valve seat portion 10 thereof, is a spider 12 carrying a tubular guide 13 which 5 projects both upwardly and downwardly from the sin 1933, Serial No. 650,398

spider to comprise a single means for guiding both of the valve members 9 and 11 in their independe ent movement to and from the seats 8 and 10 respectively. The tube 13 is ported at 14 so that regardless of any movement of the respective valves with respect to the tube, the pressure within the tube will remain the same as that within the valve seat member '7.

The valve 9 has a hollow stem portion. 15 slidably guided on the lower end of tube 13. The valve 11 has a similar hollow stem portion 16 slidably guided on the upperend of tube 13. The spider interposed between the two valve members makes it impossible for either one to affect the operation of the other. The spider serves as a means for limiting the opening movement of valve 9, while the closure4 may serve as a means for limiting the opening movement of valve 11.

When the closure is unscrewed, valve 11 may be lifted free from its guiding tube 13, and the spider 12 may readily be unscrewed to permit valve 9 to be lifted from its seat.

If the valve seat member 7 is made of brass or bronze. or other relatively soft metals in accordance with conventional valve practice, there will be a tendency for it to be warped if it is screwed into the casing under sufiicient pressure to make it reliably tight. If the seat member 7 is warped one or both of the valves 9 or 11 will almost certainly be unseated. In order to avoid any such possibility the present invention contemplates the use of a cage 20 cut away to permit free flow of fluid about the valve 11 and provided at its lower end with a ring 21 bearing about the complete periphery of the flange 22 which seats on packing 6. At its upper end the cage 20 has a second ring 23 threaded to mesh with the same casing threads in which closure 4 is engaged. Thus the cage 20 may be screwed down tight on to flange 22 in order positively to fix the position of the seat member '7 without subjecting the seat member to any appreciable torsional strains such as might warp its valve seat portions.

It will be apparent that in addition to the ready accessibility afiorded by the use of the retaining cage 20 as a means of anchoring the valve seat member '7, the present invention provides for the removal of the valve members 9 and 11 without making the operation of these members in any way interdependent. Instead of being guided with reference to any other part, each of the valve members 9 and 11 is guided with reference to the bearing member which provides seats therefor.

We claim:

1. In a valve structure, a sub-combination including a spider, a valve guide mounted in the spider and projecting in both directions therefrom, and valves independently engaging said valve guide and independently movable thereon to and from the spider.

2. In a valve structure, a sub-combination including a valve having a tubular stem closed at its end, whereby said valve is imperforate, and a tubular guide upon which said tubular stem is closely fitted, said guide being provided with a relief port through which said stem is vented.

3. In a valve organization, a sub-combination including the combination with a tubular guide centrally supported and apertured, of a pair of valve members having tubular stems reciprocable upon opposite end portions of said guide and vented through said aperture.

4. In a valve organization, the combination with a valve seat member provided with aligned seats, of a valve guide connected with said member between said seats and free at its ends, and valves independently movable upon said guide ends to and from their respective seats, each of said valves including means projecting beyond the free ends of said guide.

5. In a valve organization, the combination with a valve seat member providing spaced valve seats. of. a spider detachably connected with said member between said seats, a tubular guide carried by said spider and provided with a relief aperture between said seats, and valves having hollow stem portions closed at their ends and reciprocable on the opposite ends of said valve guide member, said stem portions being vented through said aperture.

6. In a valve organization, the combination with a valve seat member providing spaced valve seats, of a spider detachably connected with said member between said seats, a tubular guide carried by said spider and provided with a relief aperture between said seats, and valves having hollow stem portions closed at their ends and reciprocable on the opposite ends of said valve guide member, said stem portions being vented through said aperture, together with means for limiting the outward movement of one of said valves upon said guide, the movement of the other valve being limited in one direction by its seat and in the other direction by said spider.

'7. In a valve organization, the combination with a valve seat member providing a valve seat and a spider seat within said member, of a spider detachably connected with said member and resting on said seat, a tubular guide carried by said spider and provided with a relief aperture, and a valve having a hollow stem portion closed at its end and reciprocable on said valve guide member and providing a cap therefor, said stem portion being vented through said aperture.

' 8. In a valve organization, the combination with a valve seat member providing spaced valve seats, of a spider detachably connected with said member between said seats, a tubular guide carried by said spider and having free ends, valves having hollow stem portions closed at their ends and comprising caps engaged over the free ends of said guide and reciprocable thereon, and means for venting the interior of said guide, whereby to prevent transmission of movement from one valve to the other due topressures accumulating within said guide.

S. LAWRENCE WHEELER. EARL J. SEIFERT. 

